RHIC spin project -- Acceleration of polarized protons

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To achieve high energy polarized proton collisions polarized beams first have to be accelerated which requires an understanding of the evolution of spin during acceleration and the tools to control it. The acceleration of polarized beams in circular accelerators is complicated by the presence of numerous depolarizing resonances. During acceleration, a depolarizing resonance is crossed whenever the spin precession frequency equals the frequency with which spin-perturbing magnetic fields are encountered. There are two main types of depolarizing resonances corresponding to the possible sources of such fields: imperfection resonances, which are driven by magnet errors and misalignments, and intrinsic resonances, driven ... continued below

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4 p.

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Roser, T. December 31, 1995.

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Description

To achieve high energy polarized proton collisions polarized beams first have to be accelerated which requires an understanding of the evolution of spin during acceleration and the tools to control it. The acceleration of polarized beams in circular accelerators is complicated by the presence of numerous depolarizing resonances. During acceleration, a depolarizing resonance is crossed whenever the spin precession frequency equals the frequency with which spin-perturbing magnetic fields are encountered. There are two main types of depolarizing resonances corresponding to the possible sources of such fields: imperfection resonances, which are driven by magnet errors and misalignments, and intrinsic resonances, driven by the focusing fields. By introducing a Siberian Snake, which is a 180{degree} spin rotator of the spin about a horizontal axis, the stable spin direction remains unperturbed at all times as long as the spin rotation from the Siberian Snake is much larger than the spin rotation due to the resonance driving fields. Therefore the beam polarization is preserved during acceleration. Such a spin rotator can be constructed by using either solenoidal magnets for low energy beams or a sequence of interleaved horizontal and vertical dipole magnets producing only a local orbit distortion for high energy beams. Polarized proton acceleration at the AGS and the RHIC is discussed.

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4 p.

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INIS; OSTI as DE96003666

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  • Riken symposium on spin structure of the nucleon, Riken (Japan), 18-19 Dec 1995

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  • Other: DE96003666
  • Report No.: BNL--62448
  • Report No.: CONF-951269--1
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 195688
  • Archival Resource Key: ark:/67531/metadc669671

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 29, 2016, 7:16 p.m.

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Roser, T. RHIC spin project -- Acceleration of polarized protons, article, December 31, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc669671/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.